function altRows(id){
		if(document.getElementsByTagName){
	
			var table = document.getElementById(id);
			var rows = table.getElementsByTagName("tr");
				
			for(i = 0; i < rows.length; i++){
				if(i % 2 == 0){
					rows[i].className = "evenrowcolor";
				}else{
					rows[i].className = "oddrowcolor";
				}
			}
		}
	}
	window.onload=function(){
		altRows('alternatecolor');
	}